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Groups > comp.lang.python > #104939

Re: Seekable files

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On 2016-03-15, Marko Rauhamaa <marko@pacujo.net> wrote:
> Jon Ribbens <jon+usenet@unequivocal.co.uk>:
>> I'd just do something like:
>>
>>   try:
>>       fileobj.seek(where-i-want-to-seek-to)
>>   except (AttributeError, EnvironmentError):
>>       # file is not seekable
>
> Unlike Java, Python does not declare syntactically which exceptions the
> caller should expect. Unfortunately, the library documentation is not
> clear on it, either. So it is often a bit difficult to write proper
> try-except logic around a function.

This is true, although I'm not sure why you are mentioning it here
since I'm fairly sure the above code suggestion is reasonably correct
and the documentation is pretty clear.

> Having to specify the possible exceptions in Java is very painful and
> has complicated the introduction of closures to Java quite a bit.

It is one of the extremely serious design errors in Java, I think.

> I think it points to a big practical problem in the whole exception
> paradigm.

Well, no. That one individual language screwed up its implementation
of exceptions does not mean the whole concept of exceptions is broken.

> Makes you wonder if the old error code mechanism would have
> been better, after all. ("Why does Go not have exceptions?" <URL:
> https://golang.org/doc/faq>.)

I think they are wrong, and indeed their argument seems to be a
ludicrous one based upon a misunderstanding of the English meaning of
the word "exception"!

Any high-level language that does not include exceptions is not fit
for purpose, in my opinion.

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Thread

Seekable files Steven D'Aprano <steve@pearwood.info> - 2016-03-15 21:35 +1100
  Re: Seekable files Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-03-15 10:49 +0000
    Re: Seekable files Marko Rauhamaa <marko@pacujo.net> - 2016-03-15 13:16 +0200
      Re: Seekable files Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-03-15 13:49 +0000
        Re: Seekable files Marko Rauhamaa <marko@pacujo.net> - 2016-03-15 16:26 +0200
          Re: Seekable files Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-03-15 14:25 +0000

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